the classic roc is a cross with a putter. more glide, and slower. i used to have one for aproaches. not much fade, and less stable overall than a roc. for me it was a finesse disc. you couldnt quite throw it like a midrange, and you couldnt quite throw it like a putter.

im sure someone more knowledgeable will come along and mention the specifics.

The new ones do. I really enjoy both the classic, and normal Roc. The classic Roc for me works well on turnover shots where i dont need a flex, and straight line drives <220' Super glide as well. Not to mention it's my main putter. It's a finesse approach disc like Blake said, but I love it after I got used to it.

If you're switching from buzzz to Roc (not classic) then expect a little less distance for the same effort (you need to get hight on it for D) but expect more options in flight lines. Buzzzs are good at holding a big anhyzer with a small fade, straight with a small fade and hyzer sweeps. Rocs can do all those, as well as you can chose to have it turn over after 50', 150' or 250'. Much more versitile in my opinion, it takes some getting used to though as expected.